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Sounds like a bug report. Anyway, there are lots of information that is missing for anyone to be able to help you. Add to you question the output of commands 'ip address' and 'ip route' when you net works and doesn't work.
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AndersJun 14 '12 at 22:18

2 Answers
2

I've also noticed an issue with this, and it appears to be udev related. Basically, udev reassigns one of the NIC's logical names, for no apparent reason. On top of this, it appears to be messing up the MAC addresses when the dirver is actually loaded, after the logical name of the device has been changed. Time for a bug report me thinks.